Sammanfattning
Four clay materials, namely, bentonite, bleaching earth, attapulgite and sepiolite, were shaped into the cylindrical body by extrusion. Clays were characterized in depth by TEM, SEM-EDX, N2 physisorption, pyridine FTIR, pH measurements, contact angle measurements, 27Al MAS NMR, and the crush test. Catalytic properties were investigated in the citronellal cyclization as a model reaction. The reaction was performed in the trickle-bed reactor at 70 °C, 10 bar of Ar with 0.086 M initial citronellal concentration in cyclohexane. The best results were obtained over attapulgite with isopulegols yield of 24% and stereoselectivity to the desired isopulegol isomer of 61%. Attapulgite had the highest meso-to-micropore volume ratio, the highest basicity, a low Brønsted-to-Lewis acid sites ratio, and the lowest amount of Brønsted acid sites compared to other extrudates. In addition, same clay exhibited the highest mechanical strength of extrudates.
Originalspråk | Engelska |
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Artikelnummer | 118426 |
Tidskrift | Applied Catalysis A: General |
Volym | 629 |
Tidigt onlinedatum | 9 nov. 2021 |
DOI | |
Status | Publicerad - 5 jan. 2022 |
MoE-publikationstyp | A1 Tidskriftsartikel-refererad |
Fingeravtryck
Fördjupa i forskningsämnen för ”The physicochemical and catalytic properties of clay extrudates in cyclization of citronellal”. Tillsammans bildar de ett unikt fingeravtryck.Utrustning
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Åbo Akademi Functional Printing Center
Martti Toivakka (PI), Jessica Rosenholm (PI), Nicklas Anttu (PI), Johan Bobacka (PI), Tan Phat Huynh (PI), Jouko Peltonen (PI), Xiaoju Wang (PI), Carl-Eric Wilen (PI), Chunlin Xu (PI), Hongbo Zhang (PI) & Ronald Österbacka (PI)
Fakulteten för naturvetenskaper och teknikUtrustning/facilitet: Facilitet